Acute and chronic toxicity of copper on aquatic insect Chironomus ramosus from Assam, India.
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Date
2012-01
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Abstract
Acute toxicity of copper (Cu) on Chironomus ramosus was determined by exposing third-instar larvae to
graded concentrations of copper sulphate (CuSO4. 5H2O). Median lethal concentrations (LC50) of Cu as
CuSO4 at 24, 48, 72 and 96 hr were determined as 3280, 1073.33, 780, and 183 μg l-1, respectively. For
determining the effects of chronic toxicity, small first-instar larvae were individually exposed to sublethal
concentrations of copper sulphate (1.0-18.0 μg l-1) for a period of 21 days. Discoloration and thinning of body
were detected at 1 μg l-1 and ventilation movements, pupation and adult emergence were significantly affected
at 1.8 μg l-1. At 10 μg l-1 CuSO
4
concentration, growth and tube-building activities of the larva were significantly
different from the control.
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Keywords
Acute and Chronic toxicity, Median lethal concentrations, Chironomus ramosus, Copper sulphate
Citation
Majumdar T N, Gupta A. Acute and chronic toxicity of copper on aquatic insect Chironomus ramosus from Assam, India. Journal of Environmental Biology. 2012 Jan; 33(1): 139-142.